Passive Optical Networks: Recent Developments and Issues
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1 Passive Optical Networks: Recent Developments and Issues CTO and Co-Founder Nayna Networks, Inc. 180 Rose Orchard Way San Jose, CA USA Raj Jain Adjunct Professor Ohio State University Columbus, OH Invited Presentation at Optical Transmission Systems and Equipment for WDM Networking II SPIE Conference 5247, 7 11 September 2003, Orlando, Florida, USA This presentation is available on-line at ITCOM
2 !Introduction to PON: Overview "What? How? Where? Why?!Recent Developments!Issues!Challenges ITCOM
3 Access: Fiber To The X (FTTx) Service Node Internet Leased Line VOIP PSTN Video Operation System OLT Passive Optical Splitter PON System Optical Fiber ONU ONU xdsl Twisted Pair NT NT FTTP FTTH FTTB FTTC FTTCab FTTH :Fiber To The Home FTTB :Fiber To The Building FTTC:Fiber To The Curb FTTCab :Fiber To The Cabinet ITCOM
4 Passive Optical Networks! A single fiber is used to support multiple customers! No active equipment in the path Highly reliable! Both upstream and downstream traffic on ONE fiber (1490nm down, 1310nm up). OLT assigned time slots upstream.! Optical Line Terminal (OLT) in central office! Optical Network Terminal () on customer premises Optical Network Unit (ONU) at intermediate points w xdsl OLT ITCOM
5 Broadcast Video Over PON!Analog or Digital Video on 1550 nm OLT Downstream Upstream 3 Wavelengths On One Fiber Existing or New Coax GBE E1 SDH MPEG/DVB-C GBE E1 SDH ITCOM
6 PON Applications 1. FTTP 2. Cellular Backhaul STM1 STM1 STM1 Comm nxt1/e1 E1 10/100BT ATM 3. CATV MSO Remote DSLAM/DLC 4. DSLAM Aggregation ITCOM
7 Why PONs?! Reduced OpEx: Passive network " High reliability Reduced truck rolls " Reduced power expenses " Shorter installation times! Reduced CapEx: " customers per fiber " 1 Fiber +N transceivers vs N Fibers + 2N transceivers! Increased Revenue Opportunities: Multi-service: Data, E1/T1, Voice, Video! Scalable: " CO Equipment Shared New customers can be added easily as the network grows " Bandwidth is Shared Existing Customer bandwidth can be changed on demand ITCOM
8 Types of PONs! APON: Initial name for ATM based PON spec. Designed by Full Service Access Network (FSAN) group! BPON: Broadband PON standard specified in ITU G thru G = APON renamed " 155 or 622 Mbps downstream, 155 upstream! EPON: Ethernet based PON draft being designed by IEEE 802.3ah. " 1000 Mbps down and 1000 Mbps up.! GPON: Gigabit PON standard specified in ITU G and G " 1244 and 2488 Mbps Down, 155/622/1244/2488 up ITCOM
9 Telecom Developments Bad News:! Telecom companies have had their fair share of economic downturn! Number of employees has gone down! Carriers no longer can support active electronics in the field Good News:! Telecom winter is over Spring is finally here! Component prices are going down! Metro/Access Ethernet is taking off PON provides an ideal solution ITCOM
10 PON Developments! GPON recommendations G.984.x are out. EPON draft is progressing fast.! FCC removed fibers from unbundling! SBC, Verizon, Bellsouth issued an RFP in USA " Carriers in Japan and Europe are seriously investigating FTTH " Most big telecom vendors in US were caught off-guard with no PON equipment! Most action in Access than in Core or Metro! Venture Financing for PON is up " Several PON companies received funding this year! Over 800 Communities in USA are investigating fibers to home using PONs! Fiber-to-the-Home Installations Expected to Reach Approximately One Million by 2004 [FTTH Council] Conclusion: 2004 will be the year of PON ITCOM
11 Technology Issues! EPON vs BPON and GPON " Ethernet vs ATM " Future vs Present " Low cost due to high-volume Recommendation: BPON for existing environment Standard-based EPON for new installations! 155 vs 622 vs 1250 Mbps " Four 155 PONs shared by 32 subscribers each vs One 622 PON shared by 32 subscribers High-speed justified only if IP video or high-speed data services " Current DSL offerings are in Kilobits to a few Mbps " Technology alone does not make deployment " Business case will emerge only with CLECs ITCOM
12 Service Issues! Services: Triple-Play Voice, Video, Data " Quad-Play Voice, Video, Data, and TDM (T1/E1) " T1/E1 is important to maintain legacy services Leased lines are big revenue for ILECs " Recent VOIP protocols help in providing voice services but not so much in TDM " Need enhanced QoS! VOIP Service vs POTS: " In-house equipment is assumed to be POT in both cases " Signaling/ringing, power source/battery backup Centralized with copper, localized with fiber Easier with older technology but extra cost with fiber " VOIP offers numerous new features including multiple phone numbers per household. Significant impact on social behavior ITCOM
13 ! 2004 will be the year of PONs Summary! PONs reduce OpEx and CapEx for carriers and increase carrier revenue opportunities with value-added services! BPON for today and EPON for today and onwards! Multi-service support in next-generation EPON products is a key differentiator.! EPON products need to offer quad-play: Data, voice, video, and TDM to be effective ITCOM
14 PON Organizations!FSAN, fsan.mblast.com/default.asp!itu-t, ah, Forum, Council, in the First Mile Alliance (EFMA) ITCOM
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